Display panel or portion thereof with a transitional graphical user interface



FIG. 1 is a front view of a display panel or portion thereof with atransitional graphical user interface showing a first image in asequence according to my new design; and,

FIG. 2 is a front view of a second image in the sequence.

The subject matter in this patent includes a process or period duringwhich an image changes into another image. This process or period inwhich one image transitions into another form no part of the claimeddesign.

The broken lines shown in the drawings represent portions of the displaypanel or portion thereof with transitional graphical user interfacewhich form no part of the claimed design.

CLAIM The ornamental design for a display panel or portion thereof witha transitional graphical user interface, as shown and described.